EM78869 データシートの表示（PDF） - ELAN Microelectronics
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EM78869 Datasheet PDF : 38 Pages
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EM78869
8-Bit RISC Type Microprocessor
1 General Description
The EM78869 is an 8-bit RISC type microprocessor with low power, high speed CMOS
technology. Integrated into the single chip are on chip watchdog (WDT), RAM, ROM,
programmable real-time clock/counter, internal interrupt, power-down mode, LCD driver, and
tri-state I/O. The EM78869 provides a single chip solution for designing DATA-BANK of
message display.
The EM78869 is the cost-down version of its predecessor, the EM78862/B. Comparison
between the two series is as follows:
Item
EM78862
EM78862B
EM78869
ROM size
16K X 13 bit
16K X 13 bit
8K X 13 bit
RAM size
2.2K X 8 bit
2.2K X 8 bit
0.7K X 8 bit
LCD
60 X 9
60 X 9
40 X 9
LCD RAM Write only when LCD is enabled. Read/Write when disabled.
Oscillator Crystal
Crystal/RC
Crystal/RC
Code option MCLK
MCLK/OSCSEL
MCLK/ELCD/OSCSEL
Pins number 84
84
64
OTP
EM78P862A
EM78P862A
EM78P862A
2 Features
2.1 CPU
Operating voltage range: 2.2V ~ 5.5V
Operating temperature range: –20°C ~ +70°C.
32.768KHz Crystal/RC oscillation circuit selected by code option for system clock
144 byte general purpose register
640 x 8 bits on-chip data RAM
8K x 13 on-chip mask type program ROM.
Up to 29 bi-directional tri-state I/O ports
8-level stack for subroutine nesting
8-bit real time clock/counter (TCC)
Programmable free running on-chip watchdog timer
Port key scan function
Operation mode: a) Normal mode; b) Green mode; c).Idle mode; d) Sleep mode
Input port wake-up function (Port 9)
7 interrupt sources:
• 4 external (INT0 ~ INT3)
• 3 internal (one TCC timer overflow interrupt + two 8-bit counters overflow interrupt)
64-pin chip form (EM78869)
This specification is subject to change without further notice.
07.12.2004 (V1.0) 1 of 34
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